From al-Hasan ibn Hudhayfah, from his father, from Muadh ibn Kathir, who said: I (narrator) said to Abu Abdillah عليه السلام: “The people narrate among us that the Messenger of Allah سبحانه وتعالى, fasted like ‘this’ (ten fingers), and like ‘this’ (ten fingers), and like ‘this’ (nine fingers), And he demonstrated with his hand, placing one of his hands over the other: ten (fingers), and ten (fingers), and nine (fingers, but lowering down his thumb), more often than he fasted like ‘this’ (ten fingers), and like ‘this’ (ten fingers), and like ‘this’ (ten fingers), meaning ten (fingers), and ten (fingers), and ten (fingers).” He (narrator) said: “So Abu Abdillah عليه السلام, peace be upon him, said: ‘The Messenger of Allah سبحانه وتعالى, may Allah سبحانه وتعالى bless him and his family, did not fast less than thirty days, and the month of Ramadan has not decreased from thirty days since Allah سبحانه وتعالى created the heavens and the earth.’”